Method for the removal of organic substances from alkali metal aluminate solution
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United States of America Patent
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Jul 29, 1980
Grant Date -
N/A
app pub date -
Feb 12, 1979
filing date -
Feb 17, 1978
priority date (Note) -
Expired
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Abstract
In the production of alumina from bauxite by the Bayer process, the present invention provides an improvement for effectively and economically removing organic substances from a circulating alkali aluminate solution by contacting the aluminate solution containing organic substances with molecular oxygen gas or a molecular oxygen-containing gas in the presence of copper ions as a catalyst at an elevated temperature, thereby oxidizing the organic substances, adding a chemical substance to the resulting aluminate solution which reacts with copper ions to deposit a water-insoluble precipitate, and separating the precipitate from the solution, and recycling the precipitate as a copper source to the above-mentioned wet oxidation procedure.
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